flare/data/resources/ui/components/attachment_file.blp

using Gtk 4.0;
using Adw 1;

template $FlAttachmentFile : $FlAttachmentBase {
    Box box_file {
      Button {
        styles [
          "circular",
        ]
        margin-end: 6;
        clicked => $download() swapped;
        valign: center;
        icon-name: "document-save-symbolic";
      }

      Box {
        orientation: vertical;

        Label {
          halign: start;
          ellipsize: end;
          label: bind template.attachment as <$FlAttachmentObject>.name;
        }

        Label {
          styles [
            "dim-label",
            "caption",
            "numeric",
          ]
          halign: start;
          label: bind $format_size(template.attachment as <$FlAttachmentObject>.size) as <string>;
      }
    }
  }    
}